How to get 3.3 V from a charged LiPo battery?

[seanspotatobusiness]

I would like to power an Arduino Mini/Nano at 3.3 V using a LiPo phone battery with max 4.2 V. How do I render the voltage from the battery suitable for the Arduino? 4.2 V seems to be less than the minimum for all the regulators I've looked at. What should I look for? Thanks!

 

[Bluejets]

Another battery.

 

[seanspotatobusiness]

What about one of these buck boost things?

 

[BobK]

You can find low dropout regulators that will drop a couple of hundred millivolts. Or you can use a buck converter.
Bob

 

[seanspotatobusiness]

I've discovered that the board has its own regulator and will happily accept 3.3 V to 12 V so no external parts are needed!

 

[Bluejets]

The unit you link to in #3 above is a linear regulator.

You have to be careful in the translation between Chinese and English, many times they get it wrong.

Edit....according to the description, this should be the unit you require.
This is voltage adjustable up and down.

http://www.ebay.com.au/itm/New-Boos...478171?hash=item58c105649b:g:spAAAOSwEeFU8WTp

There are others that just go up and there are others as shown below in youtube, that have current regulation as well.

As a further note, this bloke has a lot of very good videos on electronics, well presented and easily understood.

 

[Audioguru]

A single Li-PO cell is 4.2V when fully charged and its charging current has dropped low, 3.7V about halfway during a discharge and 3.2V when it must be disconnected. If you do not disconnect it when its voltage is 3.2V then the voltage will go lower and ruin the battery. A Li-Po cell that has discharged too low is dangerous because it might explode or catch on fire if it is attempted to be charged. A good Li-PO charger will detect that a cell voltage is too low and refuse to charge it.